These timepieces were used by the navigator and pilot as the airplane's master time source during World War II and thereafter this example dates from W. It was intended to be set to Greenwich Civil Time (GCT).

With screw- back and bezel. Signed AN 57401 STOCK NO. AF- 56-1342 HAMILTON WATCH COMPANY" Inside of the back signed with "star watch case co. Good used condition with signs of use, s. Black Dial with Arabic hours 1-24 and seconds 5-60.

Good used original condition, s. Monometallic gold screw balance, Elinvar hairspring and index spring fine adjusting. The military Hamilton pocket watch is in good total condition and keeps correct time.